github-ci: set workflow permissions to read-all

.github/workflows/builds.yml

@@ -4,6 +4,8 @@ on:
   - push
   - pull_request
 
+permissions: read-all
+
 env:
   DEFAULT_LIBHTP_REPO: https://github.com/OISF/libhtp
   DEFAULT_LIBHTP_BRANCH: 0.5.x

.github/workflows/cifuzz.yml

@@ -1,5 +1,6 @@
 name: CIFuzz
 on: [pull_request]
+permissions: read-all
 jobs:
  Fuzzing:
    runs-on: ubuntu-latest

.github/workflows/commits.yml

@@ -3,6 +3,8 @@ name: commit-check
 on:
   - pull_request
 
+permissions: read-all
+
 jobs:
 
   check-commits:

.github/workflows/formatting.yml

@@ -8,6 +8,8 @@ on:
       - 'master-*'
   pull_request:
 
+permissions: read-all
+
 jobs:
 
   # Checking for correct formatting of branch for C code changes